SOLUTION: For the polynomial Function : F(x)=-2(x + 1/2) (x+4)^2 a)List each real zero and its multiplicity: b)Determine whether graph crosses or touches the x-axis at each x-intercept:

Algebra ->  Rational-functions -> SOLUTION: For the polynomial Function : F(x)=-2(x + 1/2) (x+4)^2 a)List each real zero and its multiplicity: b)Determine whether graph crosses or touches the x-axis at each x-intercept:       Log On


   



Question 1189458: For the polynomial Function : F(x)=-2(x + 1/2) (x+4)^2
a)List each real zero and its multiplicity:
b)Determine whether graph crosses or touches the x-axis at each x-intercept:
c)Determine the behavior of the graph near each x-intercept(zero):
d)Determine the maximum number of turning point on the graph:
e)Determine the end behavior, that is finding the power function that the graph of
f resembles for large values of |x|:

Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

For the polynomial Function :
f%28x%29=-2%28x+%2B+1%2F2%29+%28x%2B4%29%5E2

a)List each real zero and its multiplicity:
-2%28x+%2B+1%2F2%29+%28x%2B4%29%5E2=0
if %28x+%2B+1%2F2%29=0=>x=-1%2F2,..... multiplicity 1
if %28x%2B4%29%5E2=0=>x=-4,..... multiplicity 2
b)Determine whether graph crosses or touches the x-axis at each x-intercept:

For zeros with+even multiplicities, the graphs touch or are tangent to the x-axis at these x-values.
For zeros with odd multiplicities, the graphs cross or intersect the x-axis at these x-values.
x=-4 have an +even multiplicity => the graph will touch the x-axis
x=-1%2F2 have an odd multiplicity=> the graph will cross the x-axis

c)Determine the behavior of the graph near each x-intercept(zero):
Since the leading term of the polynomial (the term in the polynomial which contains the highest power of the variable) is -2x%5E3, the degree is 3, i.e. even, and the leading coefficient is -2, i.e. negative.
This means that f(x)→ ∞ as x→ -∞ , f(x)→ -∞ as x→ ∞


d)Determine the maximum number of turning point on the graph:
The maximum number of turning points of a polynomial function is always one less than the degree of the function.
This function f is a 3th degree polynomial function and has 2 turning points.

e)Determine the end behavior, that is finding the power function that the graph of
f resembles for large values of |x|:
If we expand we get
f%28x%29+=+-2+x%5E3+-+17+x%5E2+-+40+x+-+16
f%28x%29+=+-2x%5E3 ..... the dominating term